JPH0477098B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an embedding fitting equipped with a nut to be embedded in an ALC board base material for attaching an ALC board to a structural frame.

The embedded metal fittings for installing ALC boards (autoclaved lightweight aerated concrete boards) are ALC
When injecting mortar during plate forming, the nut screw hole gets clogged with mortar, so it is necessary to close it to prevent mortar from getting in. For this reason, conventionally the nut screw hole was closed by screwing a set screw, etc., but with this method, it was necessary to manually dig up the buried part of the embedded metal fitting after forming the ALC board and remove the set screw. That is, the nut cannot be opened mechanically, requiring complicated manual work, resulting in low work efficiency.

The present invention has been made in view of the above circumstances, and its object is to provide an embedded metal fitting that facilitates the opening of the nut screw hole of the embedded metal fitting by mechanization. This will be explained below with reference to the embodiments shown in the drawings.

Figures 1 and 2 show an embedded fitting according to the present invention, which consists of a plate 1 made of a steel plate and a nut 2 fixed to the surface of the plate, with a V-shaped 2 protruding from the back side.
Parallel protrusions 3, 3 are provided. A cylindrical filler 5 made of polyethylene foam is inserted into the screw hole 4 of the nut 2 to close it off, and the tip of the filler 5 projects a predetermined length from the open end of the screw hole 4.

This embedded metal fitting has the above structure. As shown in FIG. 3, this hardware is fixed to the reinforcing reinforcing bars 6 by spot welding at the apex of the protrusion 3, and is buried in the ALC board 7 by pouring mortar slurry. At this time, the mortar slurry does not enter the screw hole 4 of the nut 2, and during autoclave curing, the filler 5 is thermally melted and becomes a solidified resin 8, reducing its volume. Therefore, after autoclave curing, a gap 9 is formed outside the screw hole 4 of the nut 2 of the embedded fitting and its open end.

It was cured in an autoclave like this
Since the ALC plate has a gap 9 outside the screw hole 4 of the nut 2 and the opening end, there is no risk of the blade coming into contact with the nut 2 even if it is carved with a cutting tool, and the screw hole 4 of the embedded nut 2 can be opened externally. Can be opened.
Therefore, as in the past, nuts were dug out manually,
It is possible to omit the trouble of removing set screws, etc.

The filler inserted into the nut screw hole must be one that melts and reduces its volume at the autoclave curing temperature of the ALC board. That is, materials such as polyethylene and polystyrene that melt at a temperature around 150° C., which is the temperature of the ALC board base material during autoclave curing, and foams and hollow shells that reduce volume are suitable for this purpose. It is preferable that the filling material is fitted into the screw hole to close it, and that its tip protrudes a predetermined length from the open end of the screw hole.
If the protrusion length is short, the gap formed on the outside of the screw hole will be small, and when the screw hole is opened outward, the gap between the cutter and the nut will become narrow, which is undesirable as there is a risk of contact. Also, if the protrusion length is too long, multiple
When manufacturing an ALC board by slicing it to a predetermined thickness with a piano wire or the like, there is a possibility that the filler material will come into contact with the cutting tool such as the piano wire, which is undesirable. Generally, the protrusion length is selected from a range of approximately 5 mm to 20 mm.

FIG. 4 also shows an embedded metal fitting according to the present invention. The filler 5 of this metal fitting has a protruding portion 5a having an outer diameter approximately equal to the outer diameter of the nut 2 and a T-shaped cross section. Therefore, after autoclaving, as shown in FIG. 5, a cylindrical cavity 9 is formed at the tip of the nut 2, communicating with the screw hole 4 and having a diameter approximately equal to the diameter of the nut.
This embedded metal fitting can also be mechanized to easily open the nut screw hole to the outside.

This invention is as described above, and this embedded metal fitting is
It prevents mortar from entering the screw holes during ALC board manufacturing, and after autoclave curing, voids are formed in the screw holes and their tips, making it possible to open the screw holes by mechanization. Therefore, it is possible to improve work efficiency and reduce costs.

[Brief explanation of the drawing]

Figures 1 and 2 are a perspective view and a vertical cross-sectional view of the embedded metal fitting of the example, Figure 3 is a vertical cross-sectional view of the embedded metal fitting after it has been embedded in an ALC board and cured in an autoclave, and Figure 4. FIG. 5 is a longitudinal sectional view of another embodiment of the embedding metal fitting, and a longitudinal sectional view of the embedding metal fitting after embedding it in an ALC board and curing it in an autoclave. 1...Plate, 2...Natsu, 3...Protrusion,
4...Screw hole, 5...Filling material, 6...Reinforcement reinforcing bar,
7...ALC board, 8...solidified resin, 9...void,
5a... Filler protrusion.

Claims (1)

[Claims] 1 An embedded fitting equipped with a nut for attaching an ALC plate to a structure frame, characterized in that the nut screw hole of the embedded fitting is plugged with a filler that melts at autoclave curing temperature and reduces its volume. Embedded metal fittings.